If your iPhone 4 is on 01.59.00 baseband, then you are lucky. Ultrasn0w 1.2.1 could unlock it on iOS 4.3.1. Then some of you will be thinking why we can’t unlock it with Ultrasn0w 1.2 instead of 1.2.1. The newer version of Ultrasn0w was released in order to fix the signal bar issue after unlocking. If you use […]